Use of magnetic forces to control distance in a surface force apparatus
- 1 December 1990
- journal article
- Published by IOP Publishing in Measurement Science and Technology
- Vol. 1 (12), 1301-1303
- https://doi.org/10.1088/0957-0233/1/12/007
Abstract
A simple system that permits the surface separation to be varied smoothly and accurately in a surface force apparatus is described. It is based on the deflection of the force-measuring spring in a magnetic field gradient created by a current passing through two coils. The resulting displacement of the surface is highly linear with applied current and free of hysteresis over separations of 10 mu m or more. This allows the accurate measurement of the force between two surfaces by monitoring the difference between expected and observed spring deflection (using, for example, multiple-beam interferometry).Keywords
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